Supervisory control system



Feb. 10, 1931. WHlTE 1,792,261

suPERvIoRY CONTROI SYSTEM Original Filed Au 1925 8 Sheets-Sheet 1' INVENTOR Feb. 10, 1931 T. u. WH I'I 'E 9 SUPERVISORY CONTROL SYSTEM Original Fil 1925 8 Sheets-Sheet 2 a m G INVENTOR Feb. 10,1931. I 'r. u. WHITE 1,792,261

SUPERVISORY CONTROL SYSTEM Original Filed g- 1925 8 Sheets-Sheet 3 LEV-l2. L 1

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720/7745 M W/life.

f W ATT'oRNEY Feb. 10, 1931. 'r. u. WHITE SUPERVISORY CONTROL S YSTEM 8 Sheets-Sheet 4 Original Filed Aug. 28 5 R6. WW NNMU m Tu J www

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. x r v r Mum wmw Gm AH'ORNEY F65; 1 T. u. WHITE 1,79 ,26

SUPERVISORY CONTROL SYSTEM Original Filed g- 1925 8 Simeeizs-Sheept. 5

\Q LG is INVENTOISQ Q5 7770/7145 11 l Vfllfe. BY

4 ATTOiRNEY SUPERVI SORY CONTROL SYSTEM Original File A g- 28, m s Sheei-Sheet 7 I Thomas M Wfi/Y'e.

BY w v/ 4 1 ATTo'RNEY v Feb; 10, 1931. T. u. WHITE 6 SUPERVISORY CONTROL SYSTEM Original Fil 8. 1925 8 Shets-Sheet a l OR Thomas M W/w'fe.

4 :ATTORNEY Patented Feb. 10, 1931 UNITED STATES paramforricn THOMAS U. WH TE, or s'YoAMoRn, ILLINOIS, 'ASSIGNOB To WnsTrNeHousn ELEo R ro & MANUFACTURING COMPANY, n oonronATIo or PENNSYLVANIA I sUrnRvrsoRY CONTROL. SYSTEM 7 Application-filed August 28, 1925, Serial No. 53,113. Renewed 'j'uneifi, 1929. I

My invention relates in general to electrical control systems and more' particularly to systems for controlling 1 and supervising from a central point remotely disposed elec- 5 trical apparatus.

One of the objects of my invention is to provide an improved driving circuit for operating the elements in 'two remotely disposed groups in synohronism'. f

Another object of my invention is to provide improved means for increasing the number of apparatus units that may be selected by relay groups without increasing the number of relays in each group. p i

Another object of my invention is to provide a group of counting relays at the'central station and group of counting relays at the distant station common to several groups of selecting relays. r (3 Another objectof my invention is to provide a latching device at both the central and the distant stations for associating the various groups of selecting relays With the counting relays.

A further object of my invention is to proride improved means for obtaining synchronous operation of the switching relays which are employed to switch the counting relays.

to different groups of selecting relays. There are other objects of the invention which together with thejforegoing will be described in a detailed specification which is to follow.

In practicing my'invention, I provide a group of counting relays in the first or central station anda'group of counting relays corresponding in number at the distant or second station. Several groups of selecting relays, depending upon the number of opera tions that it is desired to perform-and super vise, are associatedwith each group-oi counting relays at both the first and second stations. A switching relay of a latching'type is provided for associating each group of. relays with the countmg relays at selecting each station.

A plurality of keys corresponding in numher to the number of apparatus units that it is desired to control are provided the first so station. Signalling lamps are-also provided 'ation. 1' a Briefly the operation of my invention is p as follows It will be assumed that "the dispatcher do sires to bring about the operation of anape paratus unit at the second station. order to accomplish this result the dispatcher Will operate the key corresponding to'the unit in the proper direction will then op'erat'e'a start key. By reason of the latter operation, the driving circuit at the first andse'cond stations begins to function to operate; the common relays in the counting relay groups in a predetermined sequence. @One of the latching relays at each station is also operated to associate the first group of selecting relays with the counting relays which are energized sequentially by the operation of the counting relays in a definite sequence, the selecting relays arealso' operated, the corresponding selecting relays in the selecting relay groups at the office and station :being simultaneouslyoperated. The operation of theselectin-g relays serves to connect the's-igntilling and control circuits with the relays at the first station that control the functionin of the signalling de- When this condition occur's,the operation of r the driving circuit 'is interrupted and a circuit is completed for bringing about the op v eration of the desired apparatus unit. 'As a result ofthe operation of this unit,-a circuit is completed for operating thesignalling device at; the first station toi ndi-cate the "oper- The action of the driving circuit is now Tosumed and continues until all-the counting relays in the counting relay groupare oper ated. After all the counting relays have been operated, thesel'ecting apparatus is released and restarted. In this case, the switching relay at both the first and second stations is operated to associate the second group of selecting relays with the relays in the counting relay groups. The driving'circuit then brings about the operation of the counting relays in the same sequence as before.

The operation of the counting relays then controls the operation of the relays in the second selecting relay group. As it has been assumed that the operated key was selected by the selecting relays of the first group, the operation of the selecting relays of the second group is without particular function at the present time. After all the counting relays ofthe counting relay groups have been operated, the selecting apparatus is restored to normal and is so maintained provided that there are no other switchingrelays and groups of selecting relays to be operated.

Reiferringnow to the drawing comprising Figs. 1 to 8 inclusive, sufficient apparatus and circuits have been shown by means of the usual conventional diagrams to enable my.

invention to bereadily explained and understood. Y The apparatusand circuits shown in Figs. 1 to 4 inclusive, are those located at the central or first'station while the apparatus and circuits shown in Figs. 5 to. 8 inclusive are those located inthe distant or second station.

In Fig. 1, relays 100 to 125, inclusive, constitute the group of counting relays. at the first station, relay 126 and127 are ofthe'usual slow-releasing type and control certain re leasing operations.

In Fig.2, relays 200 to 209' inclusive are the control relays for operating the switching relays. Relays-202 and 203 are so constructed and positioned that the armature 216 mechanically holds or latches the armatures 217 to 219, inclusive, of-the relay-203 in operated position. This mechanical construction is described in' detailin the copending application of It. J. VVensley, Serial No. 750,183, filed Nov.15, 1924, Patent No. 1,695,907, Dec. 18,

.1925. The relays 204 and 205, 206 and 207 208 and 209 are similarly constructed.

In F 3, relays 305 to,31et,inclusiv'e, comprise the first group of selecting relays at the first station. The relays 315 and 316 are switching relays at the first stationifi Relay 315 is operative to, associate the first group of selecting relays with the counting relay group. A key K2 is provided for the apparatus unit that it is desired to control. lVhenthe handle 223 is in one position,-the springs of the key are in the position shown. When the handle is turned in the opposite direction, the springs of the key K2 assume a position opposite from that shown. Relays 300 to 3041, inclusive, are associated with each key, such as K-2.

The pairs of'relays 300 and 301, and 302 and 303 have their armatures interlocked: in

the same manner as the relay 202 and 203. The relay 302 controls the operation of the signalling lamps 328 and 329. A key K1 is common to all the keys, such as K2, and is termed a control key. This key is of the usual single throw non-locking type. Keys such as K3 to K12, inclusive, which are associated with the selecting relays, are of the usual single-throw locking-type. Relays 317 to 319, inclusive, comprise part of the type and perform any desired function at the second station. A group of relays, such as 500 to 504 is associated with each circuit interrupter such as'G. Relays 517 to 521, inclusive, comprise a portion of the driving ci cuit at the secondstation.

Relays 600 to; 619, inclusive, of'Fig. 6 comprise the remaining portion of the driving circuit at the second station.

In Figs. 7, relays 700 to 725, inclusive, constitute the group of relays at the second station. Relays ('26 and 727 areslow-releasing relays and control certain releasing operations as will appear.

In Fig; 8, relays 800 to 809, inclusive, are therelays for controlling the operation of the switchingrelays such as 522 and 523. The

relays 802 and'803, 804 and 805, 806 and 807, and 808 and 809 have their armatures mechanically,interlocked in the same'nianner as the relays'202 and1203, previously described.

Having briefiy'described the apparatus shown in'the drawings, I will now explain its detailed operationQ For this purpose, it will be assumed that the circuit interrupter at the second station is open and that the dispatcher desires to close it. In order to accomplish thisresult,

the dispatcher will operate the proper key K2 into a position opposite from that shown, and will then operate the start key K. The selecting. equipment is normally held .in an inoperative position by a holding cir- This holding circuit may be traced vcuit. from ground by way of back contact and armature 431, holding relay 106, conductor 361 back contact and armature 359, conductor 363, armature 542 and its back contact, armature 5 16 and itsback contact, conductor 562, ar-

mature 639 and its back contact and holding relay v603 to battery. The holding relays 106 and 603 are energized over this circuit.

The relay 406 is operated to prepare a starting circuit at armature 433, to' open one to establish a locking. circuit foritself at armature 424 and to prepare circuit for the relay 409 at armature The relay 402 is de-energized when the battery supply is disconnected, such when .a tuseblows. 1, The 1 provision of the relay 4021nakesit necessary that battery circuit be reestablished before the selecting apparatus functionsif the bat-' teryat the dispatchers station has been disconnected. 7 j

Atthe second station the holding relay 603 is energized to prepare. a starting circuit at armature 628, to open one point inthe looking circuit of relay 604 at ar nature 629, to prepare a circuit .ior the relay 607 at the front. contact of this armature, and to complete a circuit at armature 630 that extends by way of arn1a-ture6'33 and its front contact, armature 630and relay 610 to battery. Relay 610 is energized to establish a locking circuit for itself atarinature 648 and to vpreparea circuit for the relay 601 at armature 647; Re.-

lay 610 is provided for thesanie purpose as the relay402 before described. r 7 Now when-the: key *Kds moinentarily depressed by the dispatcher, there is alcircuit completed that extends from ground by. way of the springs of key K back contact and ar-. mature 438, armature 433 and its front contact, armature 430 and its back contact, andrelay 404 to battery. The relay 404 is energized to open one point in another circuit for itself at armature 42S, andto establish, a cir-' cuit for the relay 405 over'a 'circuitthat 6X-' tends from ground by way of contact and art mature 426, armature 429, relay 405 and relay, 404 to battery. I f This circuit isinefiec'tive as l'ongwas. the key K remains depressed When the. key .14

r is released, the short circuit i srenioyed from relay 405 and'this relayis energized in series with the relay 404. Relay 405 is energized to open one point in the holding circuit at arinfature 431, and at armature 430 to open one 7 point in' the starting circuit.

hen thejholdin'g circuit is opened,, the

relays 406 and 603 are deenergized. 406 isdeenergized to prepare alocki lg cirt cuit forthe relay 403 at armature432, to open another point in the original energizing cir-I' cuit of therelay 404 at armature 433, andto complete a circuit at armature 434v that ex} tends from ground .by way of backcontact 427, armature 434fa'nd its back contact, re lay 409 and front contact and armature to battery. Relay-409is ener-gizedover'this circuit and operates toopen-anotherpoint in the original energizing circuitof the relay 404 tend byway ,i-tsiront' contact, relays and relay-1113,:

at armature 438 and to prepare a driving cire cuit at armature 439. i 1

At the first station, 'zth'e relay 4071 i also i energized'nor'mally over a path. that extends from ground by wayot back contact andarmature 360, conductor 362 and slow reelasing relay 40.7.to battery. The relay 407 is enerf gized to preparea circuit forlthe relay 408 at. armature 435. The relays 400 and 401-are also energized normally'over circuits that ex-v of the arinatures440 and 441, respectively; 1 '1 In the second station, the holding relay 603 is deenergized to openone point inthe startting circuitat armature 628, to open one pointin the circuit of the relay607. at armature 629, T

to prepare a locking circuit for therelay 604 at the back contact'ofthis armature and to complete a circuit extending from ground byway of armature 633-and its back contact I armature 630 and its back contact, relay 601,

and front contact and armature .647 tozbat tery. Relay 601is energized .to prepare an:

other starting circuit at armatures622 and 623 and to complete the. driving circuit at armature 624. 1

p The driving circuit extends frOmbattery by way-of back contact and armature 451,

relay 416, back contact and arinaturel463',

back contact and armature 437, armature 439 and its front'contact, conduct-or 470, front contact and armature: 624, armature 626 and itsv back contact, back contact and armature 649, relay 615, and armature-664 and its-back contact to ground. ,7

r The relays 416 and 615 are energized in. series. The line relay 416 upon operating completes a circuit for the relay 414 at armature 454 and at armature 453, completes a circuit for the relay413. Belay. 414,- upon operating, opens one point in the locking circuit of the relays 417 and 4 8 at armature 448 andat armature 449 completes a circuit that extendsfrom ground by way of armature, 151

and its back contact, conductor .12,;'armature 45.5 and. its backcontact,, arm-ature449 and: itsfrontcontact, relay 415. and relay 414 to: battery- Relay .415 isshor't-circuited so'long' as the original circuitfor relay 414, is maintained. Relay 413 operates to. establish a locking circuit for itself at armature 7445,

to, ground on conductor 12, to open o-nepoint injthe locking circuit of the relay-412 at arma-.

backcontact, armature 447 and its front contact, relay 411, conductor 20, armature 136 and its back contact,'-counting relay 113, ar- 1nature,1 29 and-its backcontact, back contact and armature 152 to battery. The relays 411 r and113 fare energized over this-circuit.

Relay 113 is operated to establish a circuit extendingstro'm groundby-way of armature 150 and its back contact, ar'niature138 and V armature 129 and its back contact, and back contact and armature 152' to battery. This circuit is not effective so long as the original circuit for the relay 113 is maintained.

The relay 411 is energized to open the circuit of the relay 401." The relay 401 is deat armature 454, thereby removing the short-.

., circuit from the relay 415. Therela-y 415 is energized to open another point in the driving circuit. at armature451, to open the circuit including the relays 411and 113 in series at armature 452 and to complete a circuit at the front contact of this armature for the relay 420. The relay 420 isenergized to establish a locking circuit for itself at armature 464 to ground upon conductor 12, to disconnect the relay 416from the driving circuit and to connect the line relay 419 thereto at armature 463. r 7

The relay 411'is deenergized to complete a circuit for the relay 401. The relay 401 is operated to open the circuit of the relay 408. The relay 112 is energized to prepare a circuit for the relay 125 at armature 135 to open another point in the original 'ener gizing circuit of the relay 113 at armature 136 to complete a circuit at armature 137 that extends from ground by way of armature 150 and its back contact, armature 149 and its back contact, armature 137 and its front contact, conductor 22, armature 356 and its back contact, relay 317, conductor 33, armature 129 and its back contact and back contact and armature 152 to battery.

The relay 317 is energized over the above circuit and operates to conipletea circuit at armature 354 that extends from ground by way of armature 150 and its back contact, conductor 34, armature 354 and its front contact, relay 318, relay 317, conductor 33, ar mature 129and its back contact andback contact and armature 152 to battery, and to twill be remem ate-d to'complete a circuit for the relay 617 at armature 661 and to complete a circuit for the relay 618atarmature 660. The relay 617 is energized to open a point in the circuit of the relays 613 and 614 and at armature 666, to complete a circuit at armature 667 over a path that extends from ground by way of armature 756 and its back contact, conductor 678, armature 658 and its back contact, armature 667 and front contact, relay 616 and relay 617 to battery. This circuit is ineffective to energize the relay 616 so long as the original circuit of the relay 617 is maintained.

tact, relay 712, armature 752iand its back contact, and backcontact and armature 753 to battery. I

The relay 712 is energized over this circuit and operates to complete ,a circuit that eX- tends from ground by way of armature 7 55 and its back contact, armature 738 and its front contact, relay 713,;relay 712, armature 752 and back contact and back contact and armature 753 to battery. This circuit is not effective to energize th'e-relay713 by reason of the fact that it is short-circuited bythe original circuit for the relay 712.

Now when the driving circuit is opened by the operation'of the relay 408' at the first station, the line relay 615 at the second station is deenergized. As a result of this the original circuit for the relay 618 is opened at the armature 660 and the short-circuit is removed from the relay 616 at armature 661.

Relay 616 is immediately energized to opentheimpulsing circuit at armature 665, to open 6 another point in the driving circuit at armature 664, to open another point in the circuit of the relay 617 at armature 663 and to complete a circuit at armature 662 for the relay 602. I

The relay 602 is energized to establish a locking circuitfor itself,.byaway of ground conductor 67 8, at armature 625, to prepare a new point in the drive circuit at armature 626 and to prepare a circuit for the relay 611 at armature 627. When the impulsingcir- .cuit is'opened the short circuit is removed from the relay 713 and this relay is operated to prepare a circuit'for the counting relay 700 at armature 739, to open another point in the original energizing circuit of the relay 712 at armature 740 and to complete a circuit at armature 741 thatextends from ground by way of armature 755 and its back contact, armature 728 andits'back contact, armature mea er relay 518 tobattery. I y Thecircuit in multiple with this eXtends by Way of armatiire'544 and its back con 741 and its front contact, conductor 563, and

tact, relay 521, conductor 576, and back con-'- tact and armature 753' to battery. There lay 521 is energized to complete a "circuit that extends from roand b of arinature" 755 and back contact, conductor 57 7,-

a'rmature 547 and its'iront contact,- relay 520, relay 521,- conductor and back coir tact and armature 753' to battery; r

This circuit is ineneceve to ene gize the relay 520 until the first "circuit of the relay 521 is opened. Therelay 518 is energized to prepare a circuit for the relay 519 at armature 540 and to complete a circuit at armature 541 over path that extends from ground by Way of said armature and its front con-- tact,-back'contact and armature 539, conduc tor 561, ent contact and armature 627 and relay 611-to'hattery. The relay 6111s energized to) open one point in the previously traced driving 'circuitat armature 649, to prepare a new driying'clrcuit at armature 650 and to establish a locking circuit for itself at armature 651 from ground conductor 678.

When the circuit (ifthe' slow-releasing re lay 407, at the first station, isopened by the operation of therelay319,-therel'ay407 is ture 463, back contact and armature 437,

aianature43'9 and its front contact, conductor 1 470, front contact and armature 624, annature 626 and its front cOntact arInature 650 and its front armature, line relay 612, ar1na-' ture 656 and its back contact to battery. I

Line relay 419 is operated to complete a i circuit for ther'elay 417 at armature 462 and to complete the circuit relay 412 at arin'ature 461, The relay 417 is energized to open the circuit of thereieys 414 and 415 at armature 455 and to repare a circuit at armature 456:

for the relay 418. The relay-415 is dean"- ergized to prepare a circuit for relay armature 450 and to pre ar a point in th'e driving circuit at armature 45l 'an'd to op'en the original energ zing circuit of the line relay at arinatu're452 and to prepare an impulsing circuit at the back; contact of-this" armature." The relay 414 is deenergizedto open one point of the circuit of relay 415*and to establish a cir'cuitat armature 448'that ex 3 ten'cls'irom ground on conductor-12 by Way of back contact and armature 448, armature 456 and its front contact,-relay 418 and relay 417 to battery. r

The relay 418 is not energized asring as 5%? the original circuit or the relay 417 is main tained. The relay 412 is operated to open the locking circuit or" the relay 413' at armature 442 to prepare a lockingcircuit ioritseli at' armature 443 and to complete an'iinpulsin g circuit at armature 444. The relay 413 is deenergized to open another point in the inipulslng circult at armature 447 and to complete the locking circuit of the relay 412,to'"

ground upon conductor r The inipulsing circuit now extends from ground by Way or armature 460, armature 444' and its front contact, relay 410, conductor 21,, front contact and armature 135'," armature'146" and its back contact, relay 125, armature 129 and itsback contact, and b'aclccontact and armature 152 to battery; The relay 125tifid the relay 410 are energized-over this circuit. Re1ay125 is operated to'openth'e'original en erg-izing circuit of the relay 317 at armature" 149 and to complete a circuit atthe front contact of this armature that ei ztends from ground by Way of armature 150 and its back contact armature 149 and its frontcontact,

relay 124, relay 125, armature 129ja'nd its back contact and back contact and armature 1-52 to battery.

The circuit for the relay 124 is ifiette'ctiye as long as the original energiz ng clrcult' of the relay125 is maintained 5 hen the short circuit is reinoyed item the relay 318, this relay is operatetlin series-wan the relay 317. Relay eiatpo'n operating, opens another point in theoriginal energizing V circuit of the relay 317 at arinature 356, opens the circuit of the relay 319 at arinature3 57 and at arniatures 358 and 359 connects the.

signalling'and' control, conductors 364 and 363 to the springs of thevarious selecting relays, v m all the relay groups. The relay-319 is deenergized to complete a circuit at arinature 360 for the slow-releasing relay 407. Relay 410is energized in series with the counting relay 125 andoperates to" open'thecircu'it' of relay 400. The relay 400is deeriergize'd to complete a circuittha t extends from ground byway of armature 421 and its'back contact,

front contact and armature 422, relay 408 and front contact and armature 435. v

Now when the slow-releasing relay 407 is energized over the circuit just described, ,the

ny; roe ag -operate to establish locking c rcuit for tself arrrrature' 436 andtoopen the driving circuit at arinatu're 4 37; The'line relays 419 and 612 are thereby oleenergi Zed.

Relay 419' is cieenergiz'ed" to open the original I energizing circuit of the relay 412 at annature 461 andtoren'ioye the shorhcircu'it from the relay 418'at arniature 4 621 418 is operated to open the circuit, of relay-417 at arrn'ature and to open anetherpeint in the driving circuit at arniature 4 58 ,'to1open the circuit of relay 420' at armature 459and to'open the inipuls'ine circuit at arniature 460 Thar slay 420'is d eener9jized to disconnect the line relay 419 from the drii in'gcircuit and toconnect the line'relay 416 thereto The the original energizing circuit of the relay 408. The relay 124 is energized to prepare the circuit for the count ng relay 111 at armature. 145 and to open another point nthe or ginal energizing circuit of relay125 at armature 146, to connect ground to conductor 32 at armature 147 over a path that extends from ground by way of armature 150, armature 139 and its back contact, armature 147 and its front contact, conductor 32, to spring 350, and to complete a circuit atarmature 148 that extends from ground by way of front contact and armature 148, conductor 10, armature 219 and front contact, conductor 14 and switching relay 315 to battery. I

The switchingrelay 315 is energized over this circuit and operates to connect the selecting relays 305 to 314, inclusive, under control of the counting relays 100 to 125, inclusive. Another result of'the operation of the relay 315 is that there is a circuit completed that extends from ground by way of working contact and spring 351 and said spring, conductor 19 and relay 209to battery.

The relay 209 is energized to prepare a circuit for the relay201 at armature 228, and to complete a circuit at armature 230 for the relay 206.- The relay 206 is energized to operate armature 224 thereby permitting the ar matures 225 and 226 of the relay 207 to assume their normal positions. By the operationof the armature 225, one point in the circuit of the relay 200 is opened. The operation of the armature 226 opens the circuit of the relay 208. The relay 208 is deenergized to latch armatures 228 to 230 of the relay 209 in engagement with their front contacts. 1

When the switching relay 315 is operated, as before described, there is completed a circuit that extends from ground by way of conductor 32 that was connected to ground by the operation of the armature 147, spring 350 and its working contact and selecting relay 314 to battery.

The selecting relay 314 is energized to complete a circuit for the signalling lamp 345at spring 346, to prepare a signalling circuit at spring 347, to prepare a control circuit at spring 348 and toprepare a circuit for the relay 319 at spring 349. By reason of the fact that key K2 has been operated and the springs are in a position opposite to that shown, ground is disconnected from the cone ductor extending through springs of the key 7 K12, therefore, there will be no circuit completed for the relay 319. Consequently the relay 407 Will remain energized as will the relay 408. The driving action at the first station is thus interrupted.

series'with the line relay 419. The relay 612 a is operated to complete a circuit for relay 614' at armature 653 and to complete a circuit at armature 652 for the relay 619. Upon operating, the relay 614 opens the circuit of the relays 616 and 617 atarmature 658 and ,at'armature659 prepares a circuit for the relay 613, The relay 616 is deenergized to open the original energizing circuit of therelay 602 at armature 662, to prepare a circuit for the relay 617 at armature 663, to prepare a point in the driving circuit at armature 664 and to prepare. an impulsing circuit at armature 665. i The relay 617, is deenergized to open one point in the circuit of the relay 616 at armature 667 and to complete a circuit at armature 666 that extends from ground upon conductor 678 by way of back contact and ar. mature 666, armature 659 and its front contact, relay 613 and relay 614 to battery. This circuit is ineffective to cause the operation of the relay 613 until the original energizing circuit of the relay 614 is opened. I

The relay 619 is operated to open the looking circuit of the relay 618 at armature 671,

cuit at armature 67 3., Relay 618 is deener- V gized to openanother point in. the. impulsing circuit at armature 670, to'complete a locking circuit for relay 619, at armature 669.

As previously -mentioned, the impulsing circuit extends from ground by way of armature657, armature 673 and its front contact, conductor 677, front contact andarmature 739, armature 731 and its back contact, relay 700, armature 752 audits back contact and back contact and armature 753 to battery. The relay 700 is energized to open the circuit of the relay 518 and to remove the short-circuit from the relay 520 at armature 728 and to complete a circuit at the front contact of this armature over a path that extends from ground by way of armature 755 and its back contact, armature 728 and its front contact,

relay 701, relay 700, arinature 752 and its is not, effective to bring about theoperation ofthis relay until the original circuit for the relay 700 is opened. The relay 520 is energized to open another point in the original circuit of the relay 521 at armature 544, to connectthe signalling and control conductors 364 and 363to the springs of therelays in the various selecting relay groups at armatures 545 and 546, respectively. The relay 518 is deenergized to open the original energizing circuit of the relay 611 at armature 541.v

When the relay 408 in the first station is operated, as before described, the driving circuit is opened and the relay 612 is deener- The relay 613, upon operating, opens the lock-' ing circuits of the relays'602 and 611 at arma-J- V ture 654, and opens. another point. in the orig.-

inal energizing circuit ofthe relay 614 at armature655, opens apoint inthe driving.

circuit at armature 656. and at armature 65.7 opens the 1mpuls1ng c1rou1t..- r The relay 602 is deenerglzedto. open another point in the-original energizing circuit of the relay 611 at armature 627 and to prepare the driving circuitat armature 626. Itslay 611 is deenergizedto disconnect theline relay 612 fromv thev .driving circuit and .to.

connect the linerelay .615 thereto .at arma-.

tures 650 and 649, respectively.

By the opening of the impulsing circuit the short circuitis removed'from the count-= ingrelay 701 and thls relay is energized 1n series with the relay 700. The relay 701 is operated to prepare, a circuit for the count. ing relay 714- at armature. 730, to open another point in the energizing circuit of the relay 700 at armature 731, to connect ground to conductor 575 over :a path that extends from ground by Way of armature 755 and its back contact, armature .742 and its back contact, armature 732 and its front contact and conductor 57 5 andto com lets a circuit at armature 7 29: that extends from groundby Way of said armature andits front contact,

back contact and armature733, conductor 833, armature 829 and its frontcontact, conductor 578 and switching relay 523 .to bat tery.

control of counting relays 7 'to 725, inclurelay 802 is energized to prepare .a circuit for the relay 800 at armature 816, andto com.- pletea circuit at armature 818 for the relay 805.

the relay 801is1openedi.

By the operation of thearmature: 821-, the circuit for the relay S03 is opened. The relay 803 is deenergized to retract thearmature 819 thereby latching the armature. 816, and 818 in engagement with their front contacts.

A further result of the operation of:the relay 523 is that a circuit is completed that extends from ground upon conductor, 57 by way of spring 550 and itsworking contact.

The relay 523 is energized .to connect the selecting relays 507 to.516, inclusive, under.

The relay 805 is energized. to release the; armature, 822 therebypermitting the arma-. ture 820 and821 of the relay 804 to restore to their normal position. By the. operation. of the armature820 a point in the circuit of.

andl selectingrelay 5Q7-tobatteryQ Selecting relayl 507 is energized to completea circuit? Asthe.drivingcircuit is maintained open 1 by the operation. .of therelay' 408 at .the first station,;.no..further.. selecting-action takes place. 'It will be understood thattheaction of the drivingjcircuit, by which theselecting relays. 314 ,and507 at: the first; and second stations, respectively, :are energized, .occurs substantially simultaneously. By. the'lighting of the signalling lampf345, the dispatcher is informed of the selectingposition .of the equipment. By the operation. .of'the. select.

ing. relays314 and 507, there, is a signalling circuit-that extends from ground byway of.

front contact. and armature 1526'Working contact of spring 535 and said.-spring,..front contact and armature. 545, armature543v and its 'backcontact, conductor 364,.armature' 358 and front contact, spring 347 and itsyvorking contact, armature 334- anditsback contact and relay 303 to ground... As thisflcircuit extends from ground to ground, itslfcompletion hasno function... v V

Should the signalling devices 328=and 329 at the .dispatchers office indicate a closed condition of the circuitinterrupter,the above tracedcircuit will be effective to correct the indication of the signalling devices to inform the dispatcher of the proper position. of the unit. r

Inorder to bring about the, closure of the interrupter, the dispatcher willoperate the common control key K1.. This key, it

should be noted, is designed, as is usual With 7 keys, to open contacts when moved in one direction and close the contacts .When moved inthe opposite direction. As a result of this operation, there is a-circuit completed extending from battery by Way of spring 320 and its Working cont-act, spring 321 and its work.- ing contact, front contact and armature326,

Working contact of-spring 348" and said spring, front contact and armature 359, conductor 363, armature 542 and its back contact, armature 546 and its frontcontact,

spring 535 and its Working contact, armature erated to bring about the closing of thecirf cuit interrupter.

By the operation of .the auxiliary switch 533, the circuit of the closing coil'505 is opened prepared .forthe operiingcoil anda circuit is By the operation of the auxiliary switch 532. the circuit; of. the relay 502 and therelay by way of said armature and its back contact, front contact and armature 524, conductor 560 and relay 600 to battery. The relay 600 is energized to establish a locking circuit for itself to ground by way ofback contact and armature 636 at armature 621'and to completean additional circuit for the relay 608 at armature 620.

The relay 501 is deen'ergized after a short interval of time to open the circuit of the relay 500 at armature 527. The relay 500 therefore deenergizes to connect the above traced signalling circuit to battery at. armature 526, to open the circuit of the relay 503 at armature-525, to prepare a circuit for the relay 504 at the back contact of this armature, and to open the previously traced circuit for the relay 600 at armature 52 4.

By the connection of battery to the signalling circuit, the relay 303 at the first station is operated to operate the armature 33 thereby permitting the armatures 330 to 332, inclusive, to assume their normal positions. The operation of the armature 330 brings about the effacenient of the lamp 329 and the lighting of the lamp 328. These changes in supervisory signals inform the dispatcher of the completion of the desired operation at the station. v

The operation of the armature 3'32 opens a point in the circuit of the relay .300. The

operation of the armature 331 completes a circuit for the relay 304. The relay 304 is energized to open the signalling circuit at armature 334, to complete a circuit for the relay 301 at armature 335. The circuit e2;-

tends from battery by way of armature 335 and its front contact, relay 301, and working contact of spring 324 and said spring to ground. Relay 301 is energized over this circuit and operates armature 327 to permit armatures 325 and 326 of therelay300 to assume their normal position.

By the operation of the armature 326, one point in the previously traced control circuit is opened and a new control circuit is prepared at the back contact of thisarmature. By the operation of armature 325, a circuit is completed that extends from ground by way 0]": spring 324 of key K-2 and its Working contact, back contact and armature 325, springs of key K12,.working contact of spring 349 and said spring and relay 319 to battery.

The relay 319 is energized to open the circuit of the slow-releasing relay407 at armatrue 360. The relay 407 is deenergized after a short interval of time .to open the circuit of relay 408 which is deenergized to complete the driving circuit. v. r

" lVhen the driving circuit is completed, the

of the selecting apparatus. Consequently,

the action of the driving circuit will continue, line relays 416 and 419 at the first station and the line relays 612 and 615 at the second station, being alternately operated to control the selectin'g'apparatus in a manner that will be obvious from the preceding description. i

By the operation of the line'relays 416 and 419 in the first station, the counting relays 111 and 110, 123 and 122, 109 and 108, 121 and 120, 107 and 106, 119 and 118, 105 and 104, 117 and 116, 103 and 102, 115 and 114, 101 and 100 will be energized in the sequence mentioned. By the operation of these count-- ing relays the selecting relays 313, 312, 311, 310, 309, 308, 307, 306, and 305 are energized and deenergized to prepare the control circuits in the same manner as the relay 314.

At the second station, the alternate operation of the line relays 615 and 612 brings about the operation of the counting relays 714 and 715, 702 and 703, 716 and 717, 704 and 705, 718' and 719, 706 and 707, 720 and .721, 708 and 709, 722 and 723,710 and 711,

724 and 725 which are energized in the sequence set forth. By the operation of these counting relays, the selecting relays 508, 509, 510, 511, 512, 513, 514, 515, and 516 are eneroperated simultaneously. Consequently, if-

the dispatcher desires tocontrol any other apparatus unit at the second station, its con trol will occur in substantially the same manner as before described, the action of the driving circuit being interrupted during this period.

When the counting relay 115 at the first station is operated as a result of the energizetion of the line relay .419, the circuit of the selecting relay 305 is opened at armature 143, a circuit is completed for the relay 114 at the front contact of this armature and at armature 144 the circuit of the switching relay 315 is opened. .Z'TllG counting relay 114 is short circuited until the original circuit of the relay 115 is opened. The selecting relay 305 is deenergized to restore the circuits that are controlled to normal; The switching relay 315 is deenergized to disassociate the first group of selecting relays 305'to 314, inclusive, from control of the counting relays 100 to 125, inclusive.

A further result of the deenergization of the switching relay 315 is that ground is'removed from the conductor 19. This effects operation ofthe armature 219,another point i 1 in the circuit offthejsvvitching relay 315. is

, tions." 1 i I By theconne'ction ground to conductor 7 opened. By theqoperation of'the armature 218, the'circuit of the relay204 isopened.

V The relay 204, is deenergized" to retract armature 220 Wherebythe 'armatures 221,222 and 223 are latchedin their operative posi- 232', a; circuit is completed for the relay 319. The relay 319 is energized to open a circuit for slow-releasing relay 407. The relay407 is deenergized after ,a'short interval of time to open a circuit ofthe relay 408. The relay 408 is deenergized to complete the driving circuit including the line relays 416 in series.

circuit is completed for the counting relay 101." The counting relay 101i operates tore-f 1 move groundfroni conductor 13 at armature By the operation otthe' line 1-1ay-41o,

130 and to complete a'circuit for the counting relay 100 at'the front contact of this armature; The'latter operation is inefiectiveto bring about the operation of the relay 100 untilthe original energizing circuit of the relay 101 is opened I By the disconnection of ground from conductor 13, the circuit of the relay 201 is'open ed and the relay isldeenergized to open the circuit of the relay 205 at armature 213. It also opens the circuit of the relay 806' at armature 214, and removes ground from the conductor 232 at armature 215. w

The deenergization of the relay 205 is Without particular function at the present time as its armatures are held in their operative positions. 1 By the disconnection of ground from conductor 232," the circuit of "the relay 319 is opened and this relay is deenergized to complete a' circuit'fon'the relay 407. The relay 407 is renergized to complete a circuit of the relay 408,1relays 411 and 401having been operated to prepare this circuit when the circuit of the counting relay 101 was completed. V v

The relay 408 is energized to open. the driving circuit thereby bringing about the deenerg'ization of the relay 416. As a result of the deenergization of the relay 416, relay 415 is'operated and the impulsing circuit is opened with the result that the relay 100 is operated.

: Upon energizing, the relay 1'00 removes the short circuit from the relay 127 at armature, 129. Relay 127 is energized in series With all The relay 126, upon operating, at armature 150, also removes ground from conductor 34 whereby the circuitsof the relays 317a'nd 318 are opened. The relay 317 is deenergized to open a point in the-cir cuit of the relay 318 at armature 354, to open a'point in the-circuit V of the relay 319 at'armature 355. Therelay 318 is deenergized to disconnectthe signal -'ling and control conductors 3 64 and 363 from 'thesprings of the selecting relays at armatures 358 and 359, respectively, and to prepare a point in the circuit of the holding relay 406 at armature 359and its back contact.

The relay 1271-i's deenergizedaftera short interval of time to" open a point in the circuit .ofthe sl'ovl relje'asing relay 126. By the re- =-moval ofground' from conductor 12, the relays 408, 4114, 415 and 420 are :deenergized with obvious results. I

' By the connection" of ground to conductor 11, a circuit'is completed for thejrelay 403.

Thejrelay 40'3"is energized to complete a locking circuit for itself at armature425, to open the circuit of the relays 404 and 405'at armature 426, and to open the original energizing circuit of the relay 409 at armature 427 The relay 404 is 'deener ized to prepare a' circuit for itself at armature 428 and to open a point in the circuit for the relay 405 at armature 429. Therelay405 is deenergized to preparea circuit at armature 430101: relay 404-andtoprepare a circuit at armature 431' for relay 406. v

ThesloW-releasing relay 126 is deenergized after a short interval of-time to prepare a cir-' cuit for the counting relays at armature 150,

toremove, ground from conductor llat armature 151 and to place ground on conductor 12 at theback contact of this armature.

The line relay 615 is; operated to bring about the energization of the counting relay 724 at the 'second'station. The relay 724 is operated to prepare a circuit for relay 725 at armature 750 and'to remove ground from conductor 832 at armature 749. The relay 725 is not energized until the original energizing circuit of the relay 724 is opened. The removal of ground from conductor 832 opens the circuit of the relay 800. The relay 800; is. deenergi'zed to remove ground from conductors-581 and 831 and to open a point in the circuit for the relay 806 at armature 810. Thedeenergization of the relay-806 is Without particular function at the present timeby reason of thefa'ct that the armatures 823, 824 and 825 are latched in operative position's. -By the removal of ground from conductor 831, the relay 51.8 is deenergized to re move ground from conductor 5,61.

V WVhen'the driving circuit is opened by the operation of the relay 408 at the first station,

relay 615 is 'deenergized to bring about the removal of the short circuit from the countingtirelay: 725. The relay 7 isoperated to open another point in the original energizing.

circuit of'the relay- 724 at armature 751"and' to remove the short-circuit from the relay 7126' at armature 7 52. --;lhe:re1ay 7 26 is energized! in series With the counting relays 7 00-t0 725;

inclusive. -Upon operating, relay 726i corirletesacircuit at armature 7:54 for the relay 27. The slow releasir' 'g relay 727 i'st energized to open circuitsoitheirelays 700 to 7 26.;

inclusive at armature755 to remove ground;

from conductor 67 8 at armature 7 56) and'to place ground upon conductor 674 at thefront" contact of thisarmature; A Q 7 Another result of the operation of the: ar-' mature 7 d ,the relay 727-i'szthatground'is. removed-from conductor 57 7 Wherebyfthe circ'uit of the relays 520 and 52l are opened.

The relay 521. is deenergized to open a pbint in'th e circuitof the relay 520. The relay; 520

I is dee-nergized to? disconnect they-signalling,

and control conductors 364 and3'63 frlomthe springs of theselecting relays at; armatur'es 545 and -546; respectively and to prepare a V holding circuit at armature546 and its back contact.

- The counting relays 700 to 725, inclusive,

Y are immediately cleenergi-zed.;to restore. their respective circuits to :normaL By: the: re- 36 moval of ground from conductor'678, the re-.-- lays 602, 611, 616 and 618- are deenergized with obViousresul-ts.

By the'connection of ground to conductor 674; a circuit is coinpletedforthe relay 604, The relay- 604 is energized toopen the circuit of relay- 601 at armature{633,-to estahli-sha looking circuit foritselfat armature632 and to open onepoint in the circuit of the relay;

607 at armature 631; The'relay 601 is dee-nergized to open one point in the startingcircuit' zit-armature 6.23 and to open-apoint in the driving circuit at armature 624i,

A holding circuit is new established-that extends from ground by Way} of back contactand armature 431, holding relay 1406, cone.

ductor. 36l, backcontact and arma-ture 359, conductor 36?), armature 542 andbaek cone tact, armature-5% and back contact, cond i c cuit of the relay 402 at armature 1-34.. The

relay 403 is deenergized to prepare a circuit for the 'relay 405 atarmature L26 and to'prepare another point in; the circuit of the relay e02 at armature 427. 7 p v V Atthe second station, the holclingrelay 603' is. p e t0 p p re a s a tingcircuit. at armature 628, to open a point inthe circuit of the relay 604 at armature 629, to preparea- V A -the,se nd' iem it fwii ha he lewe asing r l yfi lfl else ou a--,c-ircuit: for the relay610- at'armature 630'.-

- In a re-describedfmami n the-etai g. equ pm nt thefir tr nclth zee ondeta:

dens is released -fter all the cou ing elay have been operated thatis, ingcycle has been eornpleted .Attiie' rs statiw, itw the opera-ti fgof the relay 209' plaeed ground pon. conductor 3, Oon equ ntl Y the ow-releasing elay 4:0

J een re zidt; t;.c nr es-a: ir ui 1"v tsel t a ed 4028- T e. re ay-140 s enereizecl e mple e a point the cir'cuitof the relay .607 attlie frontcontact ofthisarmature and to; prepare-,1

Therelay 604=is= deenergized'tdprepare 'apoint in the circuit foritherelayfill'zr 36111111: tureifi land to prepare ascircui-tpitor the re-; o lay v610 at a rrnature 633. i

1 be ear-1a i cuiti-Q he;-1 e1ay e a armatu eew nd o. op' nits'o n circuit at emanate-2e; 1

The m ures4 8le l29 ar i e justed h the-a matu e 42 -eng gee sfreere ac fc eth a ma re 2.85 dis eneaee ts;

op ra ed too n the h91d fIcgwQi erated-to bring abouts-the energizationffo f the -r 1ay 0 e ay- '08 i operatedW-pre P e ci u t r-"th rel y-699a arm a-t'arma-ture 642. I

643 nd o prepar circu tsf r vt r ay 607,}

When -relay 6011 11 i l I nd of the lecti g; cycle, he rcuit of he relayi- 608. re pene -and. cenl' ea ent y he; re-

gl to Qpen; another; p t-i1 he i u t 0 he-re y 08 ata m u i and-tot CQ I lete a cir uit ar ature, 6&5 that extendsm greu d' y We? a s i armatu e, a fr'outjeo t ct, armatu 28 and fr n 00 wi e 638 an -'it ,b ceut ct a relay 6.0 I LiThe. -re y 6 5 i en rgizedc mple ct, arm re6 3-an .-itsback on c c r uitfer th -relay m term ture63 5 and a tie oeenih il eki nea, a. a a -a matu e 6. 6 Anoth r esu1tioifjthe0P-' eration of. the relay 605- is .that at "armature 3 m ci cuit i omp edfthat t ml r i grou by wayof afm i' re' 2 a d i ffr ut C ta t; fm 631 and t ba ken a -t',

front contact and" armature" 634,2 armature rcuit for the rela y 600:- 7 0 642 and its front contact, and relay 607to battery; The relay607is operatedto open the circuit of the relays 608 and 609.

' The, relay 1 608 is deenergi'zed to prepare a. locking circuit for the relay "6'00 at'a'rinature 64:4, 'toopen th'e circuit of the relay'607 at armature 642 and to open another pointin' circuit-of the'rel'ay 609 at armature "643. The

relay 609 isdeenergized' to prepare ap-oint in the circuitoftherelay 608 at a-rInatu-re' v 646 and to openthe'preyiously traced circuitf r t e relay- 605-;5Th'erelay; 696 is. imm aits" e'y 0 ris 0pe at d-v :The -r ay609ien T diately energized in series withrth'erelay 605 and Operates to open another point the original energizingcircuit of the relay 60 at armature 638, toopen another point in the a lay groups in the same manner as before.

holding circuit at armature'639 'and'to prepare a locking circuit for the relay 600 at armature 640; i

" By the "openings oftheholding circuit, the

action-of the'drivingcircuit: is again initiated to energize all therelays ln the counting re-' When the countingrelay124, at the first station is energized," the switching relay 3-16 is energized over fa circuit from ground through the front contact and armature 1 18, back contact andarmature 114, conductor 10,

contact"222, conductor and through the winding ofrelay 316 to battery 'and ground.

' Thisrelay, upon energization, associates the s cond group of selecting relays with the counting relays 100 to 125,-inclusive;---

By reasonof the fact that therelay' 205 is now operated instead-of the relay 203, the operation of the'eounting'rela-ysat the first station consequently controls the'relay's' of the second selectinggroup in a manner that is substantially the same'as has-beendescribed-in connection'with the operation of the selecting relays of thefirst group. In like manner, when the" counting relay 701 at the second sta'tion-is operated,- the switching relay 522 is operated to associate the relays-of thesecond'selecting group with the couiiting'relays 700 to 725, inclusive, by

' reason'of the fact that the relay" 806;is o'per'-'- 7 ling and control operations are performed will be obvious Without further description. After theselecting action has proceeded sufficientlyto bring about'the operation of the relay neat the first station,"the relay-200- is energized over a circuit from ground over" armature 150 and "its back contact, armature 130 and its back contact, armature 142 andrits front contact, conductors 13, front contact and armature 225fandlithe. Winding of relay 200 to battery and ground.

At the second station, relay 711 will be operated to bring about the operation. of the relay 801. Relay 801 is energized over a circuit from ground through battery,;winding of relay 801, armature 820 and its front contact, conductor 832, front contact and armature 737, back contact and armature 7 49 and back contact and armature 7 55-to ground.

By the operation of; the relay 200 atthe first station, a circuit is preparedfor the relay- 203 at armature 210, ground is placed upon conductor 18 at armature 211 and at armature 212, a circuit is-prepa're'dzfor the relay 319;- '.At the second'statiom'the operation of the .relay 801 prepares a circuit. for the relay atar1nature 815. Gircuitsare now completed for energizing the relays'203 and 808. The I relay 203-is energized to complete a circuit for.

the relay 319 at armature 217, to complete circuitfor the relay'20et at armature 218, and

to prepare a circuit i for' the switching relay 315 'at armature 219.21 Therelay 204 is 0peratedlto permit the armature 221, 222 a and 223 to-restore to normal The operation of the armature 228 opensthe circuit of the re lay 202. -.The :relay- 2021s deenergizedto retract thearmature 216. The relay-819 is op-:

erated to permit th'e'd'riving circuit to function-atthe firststation af 1 a 1Therelay: 808 at the second station is op erated to: completea'circuitfor' the relay 807 and to prepare *a' circuit for the switching:

relay 523. r The relay'807 is energized to permitthearmatures 823, 824 an'd'825 to restoreto normal. The'operation ofthe armature 824 opens the circuit of th'e relay 809. .The

tur'e 830. i 1

9o V relay809 is de'cnergized to retract thearrna- It will be noted in the resent instantiate provision is made only'fortwo cycles of selecting relays to complete the selecting operations. HOWeVer,-' aslmany groups may be provlded as s necessary to take careofi the I desired number of apparatus units byproviding other groups of selecting relays and. caus ngtheoperation of the relays such as 200 to prepare acircuit for latching relays 'such as 205. The operation of the latching relays, such as 2 05will'then prepare circuits for the additional switching' relays. The

same provision may of course be made at the secondstatlon to takeoff Whateyer addit ons arenecessary. r

hen the selecting apparatus at the first and second stations is released by the functioning ofthe' apparatus in the manner previouslydescribed, the sa me'holding circuit as has been tracedwill' be established. How-- ever, the selecting equipment will not be reoperated by reason ofthe fact that there is no ground present on the conductor 231 inasmuch as arniature'of the relays 209 are in their normal position. f course, if other groups of selecting relays were provided, the relay 207 would be operative to'place ground upon conductor 231 and the operation would be started over again in the same manner as before described until all the selection had been made.- Y

' When an apparatus unit is operated at the station either by the action of automatic devices or byreason of being manually operated by-the operator at the. second station, it is desirable that the dispatcher receive an indication of such operation. In the description of theoperation in this case, it Will be assumed red 

